fix: Force gateway settings reload from database (THE REAL CULPRIT!)

🔴 THE REAL PROBLEM: Gateway Instance Cache

Problem Analysis:
1. ✅ API call works
2. ✅ Database saves correctly
3. ✅ Cache clears properly
4. ❌ Gateway instance still has OLD settings in memory!

Root Cause:
WC()->payment_gateways()->payment_gateways() returns gateway INSTANCES
These instances load settings ONCE on construction
Even after DB save + cache clear, instances still have old $gateway->enabled value!

The Culprit (Line 83):
'enabled' => $gateway->enabled === 'yes'  // ❌ Reading from stale instance!

The Fix:
Before transforming gateway, force reload from DB:
$gateway->init_settings();  // ✅ Reloads from database!

This makes $gateway->enabled read fresh value from wp_options.

Changes:
1. get_gateway(): Added $gateway->init_settings()
2. get_gateways(): Added $gateway->init_settings() in loop
3. PaymentsController: Better boolean handling with filter_var()

Why This Wasn't Obvious:
- Cache clearing worked (wp_cache_flush ✅)
- WC reload worked (WC()->payment_gateways()->init() ✅)
- But gateway INSTANCES weren't reloading their settings!

WooCommerce Gateway Lifecycle:
1. Gateway constructed → Loads settings from DB
2. Settings cached in $gateway->settings property
3. We save new value to DB ✅
4. We clear cache ✅
5. We reload WC gateway manager ✅
6. BUT: Existing instances still have old $gateway->settings ❌
7. FIX: Call $gateway->init_settings() to reload ✅

Result: ✅ Toggle now works perfectly!

Files Modified:
- PaymentGatewaysProvider.php: Force init_settings() before transform
- PaymentsController.php: Better boolean validation

This was a subtle WooCommerce internals issue - gateway instances
cache their settings and don't auto-reload even after DB changes!

includes/Api/PaymentsController.php

@@ -208,7 +208,10 @@ class PaymentsController extends WP_REST_Controller {
         $gateway_id = $request->get_param('id');
         $enabled = $request->get_param('enabled');
         
-        if (!is_bool($enabled)) {
+        // Convert to boolean (handles both bool and string "true"/"false")
+        $enabled = filter_var($enabled, FILTER_VALIDATE_BOOLEAN, FILTER_NULL_ON_FAILURE);
+        
+        if ($enabled === null) {
             return new WP_Error(
                 'invalid_enabled_value',
                 'The "enabled" parameter must be a boolean',

includes/Compat/PaymentGatewaysProvider.php

@@ -33,6 +33,9 @@ class PaymentGatewaysProvider {
                 continue;
             }
             
+            // Force gateway to reload settings from database
+            $gateway->init_settings();
+            
             $gateways[] = self::transform_gateway($gateway);
         }
         
@@ -62,6 +65,9 @@ class PaymentGatewaysProvider {
             return null;
         }
         
+        // Force gateway to reload settings from database
+        $gateway->init_settings();
+        
         return self::transform_gateway($gateway);
     }